Henby mckinnie



July 31, 192s. 1,618,996

H. MGKINNIE BURNER Filed Jan. 23, 1926 RWA/afl) ATTORNEY 'iatented July 3l, 1928.

HENRY MCKI'NNIE, oF PITTSBURGH, PENNSYLVAN'LL' BURNER.

Appueation filled. ianuar'y 23, 1926. seria; no. sazsa My invention consistsof an vimprovement in burners for the combustion of gaseous` fuel for heating. The object in view is to provide a burner -of simple cheapconstructionin which means are provided for effecting a very thorough and complete admixture of the gas and air prior to combustion, and to f effect such combustion' immediately thereafter.

ture of gas and air at the bottom,"and having, a perforated cover, y constructed vand adapted to operate as hereinafter described.`

` Referring to the drawings;` v Fig. 1 is a-perspective view showing the burner complete from the exterior. y

Fig. 2 is a central vertical Vsection on the line II-II of Fig. 1.-

i "Fig, 3 is a cross section on the line `III-- III of Fig. 2. U

Fig. 4 isa detail view of a modified form of inltial mixer. i

The body of the burner which is essentially a mixing chamber consists of an outer enclosing sheet me-tal wall 2 of coniform shape having a closed sheet metal `bottom 3 ixedly connected with the lower edge of wall 2 by crimping or otherwise as at 4.

The wall 2 tapers from a. maximum di-4 ameter at the outer edge of bottom 3 upwardly to the top where it is provided with a. perforated covering 5, of sheet metal, wire gauze, or the like.

The proportions of the mixing chamber as thus .constructed are substantially as shown in the drawings and in one typical instance which has given excellent results in practice, the maximum diameter at the base is 6, the reduced diameter at the top 31/2 and thevertical height'll.

These proportions should be adhered to approximately in larger or smaller sizes, ,dependent on the volume of gas to be consumed, and any variations in the three d1- mensions noted should be proportionate with substantially the same taper of coni-.

form wall 2.

Gas and air in combination are introduced upwardly at the central portion of bottom 3 by delivery pipe 6 leading upwardly through a fitting 7 from any suitable prelimlnary mixer 8.

In the construction shown in Figs. l and For suchpurpose Iprovide a closed cham ber of con'iform` shape having means f or` introducing a properly proportioned adm1x which is to constantly reduce the cross area f 2 thexmixei:` 8, vknown asa Stewart mixer., provided with an adjustable air control valve v 9 adapted to increase or decreasethe air in-` let opening through thefinterveningannular.u y y spacelO. .Y ,i y

.Grasisintroduced into the middleoffthe mixer 1n the usual wayby supply pipe regulatedby controlivalve l2 yfrom anysuit- 3 ablev source of supply. The amount and pressure ofthe gas will regulate itssuction actionon the airV so that the proportions ofy the desired mixture maybe easily and ac-vv curately regulated, aswill l,bejre'adily under- 1 As thusconstructed,the combinedgasand air in proper proportions introduced cen`v trally of the base lofthe burner and passes upwardly into "the interior 13 thereof, in the p y Y formof a middle expanding column,`

Such columnr limmediately expands out- 11iI i wardly against the" lower portion 'of wall2` andy bottomA 3 vand with, a A'general upward movement through the burnerchamber to?` ward the outlet cover 5.. The resulting re-r action, effectingcomplete adinixture of the gas and air, occurs. within therchamber 13 during such movement through the upwardly diminishing space thereof, the effect of of the contained volume as it ascends.

Due to such action of the vtapered wall 2 there is a constant and increasing vreaction toward the center, together with a somewhat turbulent circulation of the mixture from the'y base upward toward the top.

The result of such action is that the fuel mixture upon arriving immediately below the perforated top 5` is inA a compacted-intimately associated condition` with a very 4thorough and even admixture ofthe' gas and air.

A further effect is thatv duev to the momen-V tum of the mixture, the. internal pressure, and ythe steadily diminishing' diameterl of the containing wall, the resulting mixture.`

emerges through the outer perforations of cover 5 ywith a pressure' materially increased over thatof the pressure at the larger vbase portion, and with a speed and resulting height of iame which is capable ofv accurate j control by valve 12 and adjustment ofthe mixture valve l9.

In operation, the mixture ascends within l the steadily decreasing cross area of the casing 2, and passes `outwardly through the,

outer perforationsof the top 5. Due to the closed bottom 3 and theabsence of any compensating additional air to the mixture' within the casing, there 1s a central limited- The effect in use is tofproduce an even a smooth flame, with the greatest heat lat its outer portion, and with a middle relatively cooler section, so that `the perforated topv is protected against destruction, 'in contrast to the ordinary `Bunsen burnery` where the central jet is constantly ofthe highest heat.

The ignition occurs immediatelyI above the perforated top 5 and results .in perfect and complete combustion with resulting heat of the highest possible degree,`

ings a of 'fixed area`,`the`mixture entering chamber 13 ofthe burnerby the central de-` livery pipe 6El as already described.-

The invention is adapted to the applica- Ation of heat to any practicableuse, and due to the fact that all of the combustion occurs above the perforated top, there is no -destruction or deterioration of any of the metal parts below such level.

l am aware that various forms. of burners havebeen utilized with perforated tops and "CQncentric walls, with more or less air supply through the bottom, but believe I am the first to utilize in a burner, an entirely closed mixture chamber of the kind shown and Vabove described,` in which the original mixture issues from the minor diameter at the top through a perforated covering.

is noted, the device may be variously l changed or altered in construction, size and different details withinthe scope of the fol-y lowin claim. i

Whatl claimv is In a fuel mixing burner, of an upwardly tapering frusto-'conical sheet metal casing having its maximum'di ameter bottom portion provided "with la flat transverse "closed"bottom` wall, a gas/and i d y air mixture pipe secured to and extending In Fig. 4 I show anotherform of stand-,Y V ard preliminary mixer 8a inl which the gas isintroduced by pipe lla andfa-ir `by openupwardiy through the central portion of the bottom wall and' slightlyabove its inner surthe combination i face, al gas supply pipe leading theretowith an intervening adjustable air supply mixer,

and a circular-'flat perforate outlet topcover` extendingacross the minimum vdiameter delivery end of the burner. 1

In testimony whereofy I hereunto aixmy signature. i v

y HENRY MGKINNIE, 

